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Old 05-19-2021, 03:55 PM   #1
leohtbaere
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Default brief "thrumming" when coming to a stop

I have a strange issue with my '92 240. Sometimes when I slow to a stop the engine will sort of thrum a little between normal RPM and what I'd call near-stall for a few seconds before smoothing out. It never actually feels like it's about to stall but the change in the characteristics is strange. My first guess is that the IAC valve is being sluggish. Has anyone else experienced this with their B230F engine?
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Old 05-19-2021, 04:24 PM   #2
planetman
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Have you checked for a funny looking animated fish wearing glasses? Das Limpet?

Have you tried doing a throttle body service/cleaning? Can you hear the throttle switch clicking as the throttle is closing with the engine not running?

I'm pretty sure there is test mode for the Bosch LH2.4 fuel injection and 1 of the tests is for checking the throttle switch and another tests the idle control motor.
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Old 05-19-2021, 04:59 PM   #3
Bready
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Quote:
Originally Posted by planetman View Post
Have you checked for a funny looking animated fish wearing glasses? Das Limpet?
DAMN IT!!!! You beat me to it.

Tipped your hand on your age there too...
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Old 05-19-2021, 06:41 PM   #4
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My first step would be spraying some WD-40 into IAC, let it sit for few minutes, than drive.
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Old 05-19-2021, 10:20 PM   #5
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Originally Posted by Bready View Post
DAMN IT!!!! You beat me to it.

Tipped your hand on your age there too...
As it happens, that movie was broadcast several times over the last week end on TV here in LA.
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Old 06-08-2021, 01:41 PM   #6
leohtbaere
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My first step would be spraying some WD-40 into IAC, let it sit for few minutes, than drive.
I ended up replacing the IAC and that seems to have helped. I'm also starting to suspect that my throttle switch is a little sticky so I'm going to clean that too.

Thanks all!
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